Do you think its worth the extra $125 (ish) for the 7970? Will I see the OC difference to make it worth the cash?
Absolutely if you have the money and are willing to spend it. The 7970 Vapor-x was out of my budget which is why i went with the 7950 Vapor-x. If i can OC mine up to and past that of a GTX 670 without increasing the voltage then i imagine the 7970 vapor-x OC right wouuld blow a GTX 680 out of the water.